Improvement in ratchet-drills



UNITED STATES ALEXANDERV Gr.l VTTIER, lOF` GHARLESTOWN, MASSACHUSETTS.

-lmPRovEMl-:NT |N `RarcHET-DmLLs.

Specification forming part of Letters Patent No. 129,696, dated July 23, 1872.

To all whom it may concern:

Beitknownthat, ALEXANDER G. VOTTIER,

Y of Charlestown, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Ratchet- Drills; and that the following is a full, clear, and exact description of the" same, reference being had to the accompanying plate of drawlng.

This invention relates more particularly to self-feeding ratchet-drills, or to those carrying two ratchet-wheels and pawls, respectively, to impart rotation to the drill or stock and to feed it forward. The invention consists, rst, in a novel construction of the handle, to receive, hold, and secure the ratchet-wheel employed to turn the stock or drill; second, of a shield partially surrounding the teeth of the feed ratchet-wheel, which shield is arranged toturn loosely upon the shaft or axis of the feed-ratchet and to move backward with the handle, but to remain stationary in the forward movement of the handle, whereby, as may be desired, with aproper adjustment, of the shield, can be secured a greater or lesser amount of feed by the feed ratchet-wheel with a given stroke or swing of the handle. v

In the accompanying plate of drawing my improvements in ratchet-drills are illustrated,

y Figure I being a side view of a ratchet-drill constructed according thereto; Fig. 2, a eentral vertical section in plane `'of line w x, Fig. l;

Fig. 3, a horizontal section in plane of line y y, Fig. 2; Figs. 4 and 5, views in detail of shield to feed ratchet-wheeL A in the drawingrepresents the stock of the ratchet-drill, provided'at one end with a socket, B, to receive a drill. This stock, from end to end, is made ofthe form shown in the drawing, and is passed through an opening, C, at one end of the handle D. This opening C is enlarged about the stock A to receive a ratchet-wheel, E, which is keyed to the stock at a and by `means of an annular screw-nut, F,

`screwed into the open end G of the handleopenin g G, about the stock A, confined in place between such nut F and the shoulder H,.at

the other end of opening C. I, a spring-pawl arranged on handle D, in position to engage i teeth of ratchet-wheel E, and to turn the same, as in ordinary ratchet-drills; K, a sleeve, ar-

ranged loosely onthe extension L of stock A,

vouter end of stock A. or near the face M of handle D, and at such and eoniined from escape bya screw-nut, b, on This sleeve K ends at end is keyed at C to a ratchet-wheel, N, which is the feed ratchet-wheel of the ratchet-drill.

This ratchet N rests upon the face M of handle D, and by a spring-pawl, O, of the handle is adapted to be turned in the one or forward movement of the handle, the pawl in the other or backward movement of the handle passing freely over the teeth of the ratchet. The upper end of the ratchet-sleeve K is provided with a male screw-thread, d, toreeeive the female screw-thread of an outer incasing-sleeve, P, having a cone-point, Q, to rest against the support for the drill. The turning of the feedratchet N screws its sleeve out of its incasingsleeve P and thus feeds the drill forward. It, a shield of a semicircular shape from end to end, or nearly so, the radius of its circle being somewhat greater than the radius of the ratch- Vet-wheel N. This shield is arranged on and secured by a set-screw, g, to a collar, f, of the ratchet-sleeve K, which collar f is' free to turn on said sleeve, and, by the shield R, the teeth of the ratchet-wheel N are shielded from the pawl D, as is plainly shown. h, a pin fastened Vin handle D within the shield It. By the abutment of this pin h against the partition fi, which is of the collar to which the shield is attached, the shield It, as the handle is swung backward, is carried around with the handle, the pin playing in the forward and backward movements of the handle within the circular slot l of the shield R. The operation of the shield It, in connection with 'the feeding of the drill or stock, is as follows: Suppose the shield and other parts of the ratchet-drill to stand in the relative position shown in Fig. 3 of the drawing, and that then, for a quarter of a circle, the handle be turned backward, it is plain that, until the pin h of the handle abuts against the partition c', there is no movement of the shield R, but that then said shieldmoves with it till the quarter circle is completed, and that then, moving the handle forward to its original position, the pawl, O, after it has passed the end m of the shield B., interlocks with the ratchet-teeth, carrying the wheel N then forward.

Thus it will be seen that, according as the shield is moved backward by the handle a greater or lesser distance, the greater or lesser 2. The shield plate It, in combination with the feed ratchet-wheel N and handle D, having pin h, all constructed and arranged relatively to each other and to the pawl O substantially as and for the purpose described.

The above specification of my invention signed by me this 23d day of February, A. D. 1872.

ALEX. G. VOTTIER.

Witnesses:

J. P. MGELROY, EDWIN W. BROWN. 

